204 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



Accipiter erythrocnemis Sclater and Salvin, Ibis, 1859, 218 (Coban, Guatemala; 



crit.). — Salvin, Ibis, 1861, 140, in text (Vera Paz, Guatemala). — Sclater, 



Proc Zool. Soc. London, 1866, 303, part (Guatemala). 

 (?) A [ccipiter] salvini (not Nisus salvini Ridgway ?) Salvin and Godman, Ibis, 



1892, 328 (Matagalpa, Nicaragua; crit.). 



Genus HETEROSPIZIAS Sharpe 



Spizigeranus (not Spizageranus of Kaup, 1844) Gray, Hand-list, i, 1869, 9. 



(Type, by monotypy, Falco meridionalis Latham.) 

 Spizageranus (not of Kaup) Agassiz, Nom. Zool. Index Univ., 1848, 1008. 

 Heterospizias Sharpe, Cat. Birds Brit. Mus., i, 1874, 160. (Type, by monotypy, 



Falco meridionalis Latham.) 

 IJrubitinga Reichenow, Die Vogel, i, 1913, 390, part. 



Medium-sized or rather large long-legged, long-winged hawks (wing 

 about 383-470 mm.) with relatively very short toes, scutella of acro- 

 tarsium mainly on outer side, only upper fourth of the long tarsus 

 feathered in front, wing tip more than one-third the length of wing, 

 first (outermost) primary longer than eighth, and coloration of adults 

 chiefly cinnamon or cinnamon-rufous, the underparts barred with 

 dusky. 



Bill rather small, the culmen (chord) less than one-fourth as long 

 as tarsus though much longer than claw of hallux, the tip of maxilla 

 (unguis) not strongly decurved though well produced, the depth of 

 bill at base of culmen equal to nearly twice its width at same point; 

 gonys nearly straight, ascending terminally, not prominent basally; 

 maxillary tomium slightly incised or concave near base of unguis, 

 slightly convex immediately behind the concavity; anterior outline of 

 cere slightly convex in front of nostril, nearly straight below the 

 nostril, its lower end on same vertical line with middle of nostril; 

 nostril rather large, nearly circular, situated above middle of cere and 

 rather close to its anterior edge. Wing long, rather pointed, the long- 

 est primary exceeding distal secondary by more than one-third the 

 length of wing; fourth, or fourth and fifth primaries (from outside) 

 longest, the third very little shorter, the first (outermost) intermediate 

 between eighth and seventh; five outer primaries with inner webs 

 obliquely emarginated or deeply sinuated, the narrowed distal portion 

 straight. Tail less than half as long as wing, its tip usually slightly 

 emarginate. Tarsus about one-fourth as long as wing, more than 

 half as long as tail, rather compressed, feathered for about upper 

 fourth in front, the large scutella of acrotarsium on outer side, those 

 of planta tarsi mostly on inner side; middle toe much less than half 

 as long as tarsus; outer toe slightly longer than inner toe, the end of 

 latter reaching to about middle of penultimate phalanx of middle toe; 

 hallux decidedly shorter than either lateral toe, its claw slightly shorter 

 than the digit and much less than twice as long as that of outer toe. 



